I have never noticed your reply.
I did play it from time to time, mostly solo, or casual oneshots with a group.
I want to say, I really like how clear and understandable the book is. Indie TTRPGs often have problems with explaining the rules clearly, but this one leaves no space for confusion, both when I play solo or DM for somebody. The combat system is also pure gold. Simple and beautiful.
Generally, I don't feel like I understand BURST deep enough to make serious suggestions, but one thing that I was missing all along was a way to reward the players between level ups. There is no currency, nor shops to spend it on, no consumables, no stats to be modified...
Purely narrative reward doesn't give players brains enough happy juice and rewarding them with tokens quickly gets out of hand.
Also, i'd say that the game RAW fits very poorly for horror adventures, but it can be dealt with. Besides, Horror doesn't seem to be the main focus of the product